[Bug target/31640] cache block alignment is too aggressive on sh-elf

[chrbr at gcc dot gnu dot org]

------- Comment #1 from chrbr at gcc dot gnu dot org  2007-04-20 14:13 -------
Created an attachment (id=13391)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13391&action=view)
Illustrative patch to not align small basic blocks

I used this patch to reduce the number of basic blocks aligned on cache-lines.
My choice was not to align blocks less than 16 bytes (also tried 32 bytes)
seems to give the best results. 

Note than never aligning doesn't degrade eebmc perfs (similar to
-falign-jumps=1)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31640